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No SBR paperwork required for any length upper on a machinegun receiver.  Legally a machinegun is a machinegun and not a rifle under Title II, so it can't be a short-barreled rifle.

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When you do this - I wasn't sure if it was just a single rifle, or a bunch of them - do yourself and your Dept a favor and really lock away the old parts.  Don't let anyone give in to the temptation to add them to their personal "retro" rifle build or sell the parts on eBay.  Ask me how I know


Local newspaper headline, "Police officer nabbed selling machine gun parts on the Internet".  

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That's what we did. We bought new LPK's and pulled the originals out and sealed them in plastic evidence bags (what we had on hand and tamper resistant) and tagged each bag with the serial number of the rifle it came from. Those are locked in armory in HQ.

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We converted most of ours to 14.5" or shorter, and all except SWAT's are now semi-auto via an AR safety swap. They're still legally machineguns (as Circuits stated) whether they can fire fully automatically or not, so any barrel length is allowed.

If you want to make SBRs out of normal semi-auto AR lowers (not 1033 M16's) then just register them tax-exempt on a Form 1.

Also as stated, with regards to the original M16 parts {in Act of Valor voice} "Put that gear in a box. Lock it DOWN."
Nobody wants to be filling out one of these: https://www.armyproperty.com/Resources/Forms/PDF/PDF-DD-200.pdf


We obtained used M4A1 SOCOM barrels through the RTD program (subset of LESO/1033). They were $20 each. They can be chopped shorter. No modification restrictions on RTD gear.


It's really hard to find all the carbine conversion parts on there though. I've been looking over a year, and only scored 3 stripped buffer tubes. KAC RAS or DD RIS II are quite rare as well. Plenty of NOS M4 plastic hand guards (which is what Patrol has unless they buy their own rails). We did get enough Surefire M951 lights for everybody. I think they were $7 each. Some were DOA.